The quotactl()
system call is used to manipulate disk quotas on a filesystem; it can
be used to turn quota enforcement on or off, change quotas, retrieve
current usage information, and more. The 5.13 merge window brought in a
new variant of that system call that was subsequently disabled due to API
concerns; its replacement is now taking form.

Source: LWN.net – [$] quotactl_path() becomes quotactl_fd()